Question

What is the correct `IUPAC` name of the compound shoown below?

A. `3-(3-`bromo`-5-`hydroxy phenyl`)` benzonitrile
B. `5-`bromo`-3-(3-`cyanophenyl`)`phenol
C. `3-(3-`hydroxy`-5-`bromophenyl`)` benzonitrile
D. 3-(bromo-5-(3-cynanophenyl) phenol

Answer 1

Correct Answer - a
`-CN` has higher priority than `-OH` group, hence the phenyl ring containing `-CN` is the parent ring. In the locant ring, both `-OH` and `-Br` are equidistant from the branch point, hence numbering is doen in alphabetical order giving lower number to bromo substitutent as `:`

`3-(3-`bromo`-5-`hydroxyphenyl`)` benzonitrile